Hello!
There is such a problem in the network. There is a C9500-40X core, it is responsible only for the user segment of the LAN (desktop PC, IP phones, printers, air conditioners, UPS, video cameras, etc.). Eleven floors are connected to it via MM fiber, two Cisco SFP-10G-SR-S modules, on each floor there is a stack of two or three C9300-48P, several neighboring buildings are also connected via SM fiber, two Cisco SFP+ 10G LRM modules, interfaces are aggregated everywhere. Everything was always fine, but for a month now, every week, the connection with the fifth floor is lost, maybe during the day, maybe at night. I changed the SFP modules both on the floor and on the core, changed the optical patch cord and rebooted the stack on the fifth floor. If you look at the channel status on the stack, when the connection is lost, then the aggregated interfaces show suspended at this time, at the moment I have disassembled the aggregation between the floor and the core, last night the connection was lost again, but after four minutes it was restored by itself.
The network core is a VTPv3 Primary Server domain, all other switches are clients. In general, there are no problems in the network globally. I cannot understand whether there is a loop somewhere, or the problem is in the optical line between the floor and the server room. The building is new, less than three years ago it was put into operation.
On July 22, when I first disassembled the aggregation on the fifth floor, then began to disassemble the network core, but did not physically disconnect the fiber optics, the network went down in the user segment, rose immediately after the physical disconnection of the fiber optics to the fifth floor. What broadcast\multicast indicator is considered abnormal if there is a loop in the network?
C9300 Port settings
interface GigabitEthernet1/0/1-48
description --Client access--
switchport access vlan 30
switchport mode access
switchport nonegotiate
switchport voice vlan 111
load-interval 60
udld port aggressive
storm-control broadcast level 20.00
storm-control multicast level 87.00 65.00
storm-control unicast level 87.00 65.00
spanning-tree portfast
spanning-tree bpduguard enable
interface TenGigabitEthernet3/1/8
description -to C9500-Core-
switchport trunk native vlan 100
switchport mode trunk
switchport nonegotiate
There is no information output, both on the core and on the fifth floor switch
@Leo Laohoo написал (-а):
@eugeneworon wrote:
I had to remove the port aggregation to check.Put the etherchannel config back in.
OK. I'll return the aggregation a little later.
I set up a port channel on Thursday, today it crashed again
I don't think it's aggregation. Without aggregation, the ports were also disconnected, but they turned on automatically within five minutes.
